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The integral of a function times a constant ($3$) is equal to the constant times the integral of the function
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$3\int x\cos\left(2x\right)dx$
Learn how to solve integral calculus problems step by step online. Find the integral int(3xcos(2x))dx. The integral of a function times a constant (3) is equal to the constant times the integral of the function. We can solve the integral \int x\cos\left(2x\right)dx by applying integration by parts method to calculate the integral of the product of two functions, using the following formula. First, identify u and calculate du. Now, identify dv and calculate v.